package top.atluofu.luofuecommerce.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import top.atluofu.common.to.mq.StockDetailTo;
import top.atluofu.common.to.mq.StockLockedTo;
import top.atluofu.common.utils.PageUtils;
import top.atluofu.common.utils.Query;
import top.atluofu.common.utils.R;
import top.atluofu.luofuecommerce.vo.SkuWareHashStock;
import top.atluofu.luofuecommerce.ware.dao.WareSkuDao;
import top.atluofu.luofuecommerce.ware.entity.WareOrderTaskDetailEntity;
import top.atluofu.luofuecommerce.ware.entity.WareOrderTaskEntity;
import top.atluofu.luofuecommerce.ware.entity.WareSkuEntity;
import top.atluofu.luofuecommerce.ware.exception.NoStockException;
import top.atluofu.luofuecommerce.ware.feign.OrderFeignService;
import top.atluofu.luofuecommerce.ware.feign.ProductFeignService;
import top.atluofu.luofuecommerce.ware.service.WareOrderTaskDetailService;
import top.atluofu.luofuecommerce.ware.service.WareOrderTaskService;
import top.atluofu.luofuecommerce.ware.service.WareSkuService;
import top.atluofu.luofuecommerce.ware.vo.*;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wareSkuEntityQueryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            wareSkuEntityQueryWrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            wareSkuEntityQueryWrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wareSkuEntityQueryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.isEmpty()) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStockLocked(0);
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuinfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }
            wareSkuDao.insert(wareSkuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        return skuIds.stream().map(skuId -> {
            SkuHasStockVo skuHasStockVo = new SkuHasStockVo();
            long count = baseMapper.getSkuStock(skuId);
            skuHasStockVo.setSkuId(skuId);
            skuHasStockVo.setHasStock(count > 0);
            return skuHasStockVo;
        }).collect(Collectors.toList());
    }


    /**
     * 锁定指定订单的库存
     *
     * @param vo
     * @return (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的性情
         * 追溯
         */
        // 1、保存库存工作单
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        // 1、每个商品在哪个库存里有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHashStock> collect = locks.stream().map(item -> {
            SkuWareHashStock stock = new SkuWareHashStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            // 查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHashSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        // 2、锁定库存
        for (SkuWareHashStock hashStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hashStock.getSkuId();
            List<Long> wareIds = hashStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                // 没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            // 1、如果每一个商品都锁定成功，将当前商品锁定了几件的的工作单记录发送给MQ
            // 2、如果有一个商品锁定失败，则前面锁定的就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //      1、
            for (Long wareId : wareIds) {
                // 成功就返回1，否则就返回0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hashStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    // TODO 告诉MQ库存锁定成功
                    // 2、保存库存工作单详情
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hashStock.getNum(), taskEntity.getId(), wareId, 1);

                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, stockDetailTo);
                    // 只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    // 当前仓库锁失败，重试下一个仓库

                }
            }
            if (!skuStocked) {
                // 当前商品所有仓库都没有锁住，其他商品也不需要锁了，直接返回没有库存了
                throw new NoStockException(skuId);
            }
        }

        // 3、运行到这，全部都是锁定成功的
        return true;
    }


    /**
     * 1、库存自动解锁
     * 下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁
     * 2、订单失败
     * 锁库存失败，则库存回滚了，这种情况无需解锁
     * 如何判断库存是否锁定失败呢？查询数据库关于这个订单的锁库存消息即可
     * 自动ACK机制：只要解决库存的消息失败，一定要告诉服务器解锁是失败的。启动手动ACK机制
     */
    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetailTo();
        Long detailId = detail.getId();

        /**
         * 1、查询数据库关于这个订单的锁库存消息
         *    有，证明库存锁定成功了。
         *      1、没有这个订单。必须解锁
         *      2、有这个订单。不是解锁库存。
         *          订单状态：已取消：解锁库存
         *          订单状态：没取消：不能解锁
         *    没有，库存锁定失败了，库存回滚了。这种情况无需解锁
         */

        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            // 库存工作单的Id，拿到订单号
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            // 根据订单号查询订单的状态
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    // 订单不存在、订单已经被取消了，才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        // 当前库存工作单详情，状态1 已锁定但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                } else {
                    // 消息拒绝以后重新放到队列里面，让别人继续消费解锁
                    throw new RuntimeException("远程服务失败");
                }
            }
        } else {
            // 无需解锁
        }
    }

    /**
     * 解库存锁
     *
     * @param skuId        商品id
     * @param wareId       仓库id
     * @param num          解锁数量
     * @param taskDetailId 库存工作单ID
     */
    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        // 库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        // 更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);
        orderTaskDetailService.updateById(entity);
    }

    /**
     * 防止订单服务卡顿，导致订单状态一直修改不了，库存消息优先到期。查订单状态肯定是新建状态，什么都不做就走了
     * 导致卡顿的订单，永远不能解锁库存
     *
     * @param orderTo
     */
    @Transactional
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        // 查一下最新库存的状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTeskByOrderSn(orderSn);
        Long taskId = task.getId();
        // 按照工作单找到所有 没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", taskId)
                .eq("lock_status", 1));
        // 进行解锁
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }


        @Data
        class SkuWareHashStock {
            private Long skuId;     // skuid
            private Integer num;    // 锁定件数
            private List<Long> wareId;  // 锁定仓库id
        }


    }
}